Well the majority of games don't support quad cores, and in the future probably won't either, it will just be more support for dual cores. The game industry programs for the mass of the people, not just the people who have very high performing machines.
There will be more dual core than quad core in the coming years, so yah maybe a few games will utilize all 4 cores but in the mean time, if all you do is game with the quad, you just have a processor that runs hotter than the dual cores but getting the Same performance out of it while gaming.
If you bought the quad for other things than gaming then that makes perfect sense.
But in the end games are just going to get more optimized for dual cores while they put the quad cores on the back burner until they become more mainstream.
Sure a select few games will support all 4 cores but not the majority.
When the new processors come out in early 09 or late 08 I'll be buying one of those suckas until then, my single core is doing just fine ^_^;;